docs: def _get_datetimes(timestep, is_leap_year):
          """List of datetimes based on timestep.
  
          This method should only be used for classmethods. For datetimes use datetiems or
          hoys methods.
          """
          hour_count = 8760 + 24 if is_leap_year else 8760
          adjust_time = 30 if timestep == 1 else 0
          return tuple(
              DateTime.from_moy(60.0 * count / timestep + adjust_time, is_leap_year)
              for count in xrange(hour_count * timestep)
          )